NEET 2016 Phase 2 | Atoms and Nuclei Question 27 | Physics

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

If an electron in a hydrogen atom jumps from the 3^rd orbit to the 2^nd orbit, it emits a photon of wavelength $$\lambda $$. When it jumps from the 4^th orbit to the 3^rd orbit, the corresponding wavelength of the photon will be

$${{16} \over {25}}\lambda $$

$${9 \over {16}}\lambda $$

$${{20} \over 7}\lambda $$

$${{20} \over {13}}\lambda $$

NEET 2016 Phase 2

MCQ (Single Correct Answer)

-1

Out of Syllabus

The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

When an $$\alpha $$-particle of mass m moving with velocity v bombards on a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on m as

$${1 \over {{m^2}}}$$

$${1 \over m}$$

$${1 \over {\sqrt m }}$$

NEET 2016 Phase 1

MCQ (Single Correct Answer)

-1

Given the value of Rydberg constant is 10⁷ m^$$-$$1, the wave number of the last line of the Balmer series in hydrogen spectrum will be

0.25 $$ \times $$ 10⁷ m^$$-$$1

2.5 $$ \times $$ 10⁷ m^$$-$$1

0.025 $$ \times $$ 10⁴ m^$$-$$1

0.5 $$ \times $$ 10⁷ m^$$-$$1

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